免费观看黄A片在线观看,乱码1乱码2美美哒,男男做愛高潮抽搐男精,白色乳息樱花未增删带翻车,被黑人强到高潮喷水A片

British standard BS476 single layer fire-resistant glass

2021-05-20 805

The single layer fire-resistant glass has fire-resistant integrity and belongs to Class C (E) fire-resistant glass. It has the characteristics of high glass strength, good fireproof integrity, smoke resistance and weather resistance. Its strength is 6-12 times that of float glass, 1.5-3 times that of tempered glass, which can prevent indoor fire from spreading outward and outdoor fire spreading indoors.

The technical parameters of the British Standard series single fire-proof glass are as follows:

Top